The LFC (Level of Free Convection)
is the level at which a lifted parcel begins a free acceleration upward
to the equilibrium level. Recent preliminary research suggests that
tornadoes become more likely in supercells when LFC heights are less
than 2000-m above ground level.

The EL (equilibrium level) is the level at which a lifted parcel becomes
cooler than the environmental temperature and is no longer buoyant
(i.e., "unstable" ). The EL is used primarily to estimate the height
of a thunderstorm anvil.

The height difference between this parameter and the LCL is important
when determining convection initiation. The smaller the difference
between the LFC and the LCL, the more likely deep convection becomes.
The LFC-LCL difference is similar to CIN (convective inhibition).